Try reading the Article of Faith that explains some of this and other beliefs.

“We believe in the literal gathering of Israel and in the restoration of the Ten Tribes; that Zion (the New Jerusalem) will be built upon the American continent; that Christ will reign personally upon the earth; and, that the earth will be renewed and receive its paradisiacal glory.http://lds.org/scriptures/pgp/a-of-f/1?lang=eng
Be sure to follow the footnotes.

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